Shandong Zhongjie Special Equipment specializes in: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products including denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment sets; central air conditioning and HVAC equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Nitrogen purge in liquid nitrogen storage tanks refers to the process of injecting nitrogen gas into the tank to increase the nitrogen concentration and pressure inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when performing nitrogen purge in liquid nitrogen storage tanks:
Safe Operation: Prior to conducting nitrogen charging operations on liquid nitrogen tanks, it is mandatory that operators possess relevant safety knowledge and operational skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for inerting operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could adversely affect the liquid nitrogen within the storage tank.
Nitrogen Charging Speed Control: During the nitrogen charging process, the speed of nitrogen charging should be controlled to avoid it being too fast or too slow. A too fast nitrogen charging speed may cause excessive internal pressure in the storage tank, whereas a too slow nitrogen charging speed may result in extended charging time.
Pressure Monitoring: During the nitrogen filling process, the internal pressure of the tank should be regularly monitored. Ensure the internal pressure of the tank stays within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, attention should be given to controlling the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and dew on the tank and pipes. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew.
Post-nitrogen flushing treatment: After the nitrogen flushing operation is completed, promptly shut down the flushing equipment and inspect and clean the tank. Ensure there is no residual nitrogen or impurities inside the tank.
Note: Nitrogen charging operations for liquid nitrogen storage tanks must strictly adhere to the relevant safety standards.

Several factors need to be considered when determining the design pressure and calculated pressure of a liquid oxygen storage tank:
Design Pressure: Design pressure refers to the maximum pressure a tank can withstand under normal operating conditions. When determining the design pressure, factors such as the working pressure range of liquid oxygen, the material strength of the tank, and safety factors must be considered. Generally, the design pressure should be slightly higher than the high working pressure of liquid oxygen to ensure the tank's safety and reliability within the normal operating range.
Calculation Pressure: The calculation pressure refers to the actual working pressure of the tank under the design pressure. It is determined by calculating factors such as the characteristics of liquid oxygen, the geometric shape of the tank, and the material strength. The calculation pressure should take into account factors like the expansion coefficient of liquid oxygen, temperature changes, and pressure fluctuations to ensure the safety and stability of the tank under actual working conditions.
Determining the design and calculation pressures for liquid oxygen storage tanks usually requires reference to relevant standards and specifications, such as Standard GB150 "Steel Pressure Vessels" and GB18442 "Technical Conditions for Storage Tanks of Liquid Oxygen, Liquid Nitrogen, and Liquid Argon." These standards and specifications provide detailed design and calculation methods to ensure the safety and reliability of the tanks.
In practical applications, the design pressure and calculated pressure of liquid oxygen storage tanks should be calculated and determined by pressure vessel designers. They will consider various factors such as specific engineering requirements, tank dimensions, and materials to ensure that the tank's design and use comply with relevant safety standards and regulations.

When initially using a liquid nitrogen tank, there are several precautions to consider for safe and effective operation. Here are some suggested precautions:
Safe Operation: Liquid nitrogen is a cryogenic liquid with strong refrigerating and asphyxiating properties. When handling liquid nitrogen tanks, it is mandatory to wear appropriate personal protective equipment, such as insulated gloves and protective suits. Avoid direct contact with liquid nitrogen to prevent injury or other harm.
Ventilation Environment: Liquid nitrogen evaporation produces a significant amount of gas, which may displace other gases, resulting in a decrease in oxygen content in the air. Therefore, when using liquid nitrogen tanks, it is essential to ensure good ventilation in the operational area to prevent oxygen deficiency.
Tank Inspection: Prior to the first use of the liquid nitrogen tank, a thorough visual inspection and seal integrity check should be conducted. Ensure there are no visible damages, leaks, or other safety hazards. If any issues are found, they should be repaired or the tank replaced promptly.
Tank Filling: Prior to the initial use of the liquid nitrogen tank, it is necessary to fill it with liquid nitrogen. During the filling process, adhere to the correct operational procedures and safety protocols to ensure a safe and reliable filling. Additionally, pay attention to controlling the filling speed and pressure to avoid excessive tank pressure and temperature rise.
Labeling and Record Keeping: Prior to the initial use of the liquid nitrogen tank, relevant information should be labeled on the tank, such as the storage medium, capacity, manufacturing date, etc. It is also recommended to establish a usage record for the tank, including filling dates, filling quantities, and usage details, for future tracking and management.
It's important to note that the use of liquid nitrogen tanks involves safety risks such as low temperatures and high pressures. Operators should receive training and strictly adhere to the relevant operational procedures and safety measures. If you're not familiar with the operation or have doubts, it's recommended to consult with individuals or relevant organizations for guidance.

A 50-cubic-meter liquid oxygen tank refers to a storage tank with a capacity of 50 cubic meters. Liquid oxygen tanks are commonly used for storing and supplying liquid oxygen for applications such as laboratory research, etc.
Key features and configurations of a 50 cubic meter liquid oxygen storage tank may include the following aspects:
Volume: A 50 cubic meter liquid oxygen tank can store a large quantity of liquid oxygen.
Structure: Liquid oxygen tanks typically feature a double or multi-layered design, filled with insulating material in between to minimize heat transfer and evaporation of the liquid oxygen. The tank material is usually stainless steel or aluminum alloy, offering excellent corrosion and low-temperature resistance.
Insulation Layer: The insulation layer of liquid oxygen storage tanks typically consists of multi-layered insulating materials, such as polyethylene foam, glass fiber, and vacuum layers, to minimize heat transfer and the evaporation of liquid oxygen.
Temperature Control System: Liquid oxygen storage tanks are typically equipped with a temperature control system to regulate the tank's temperature, maintaining the低温 state of liquid oxygen.
Safety Equipment: Liquid Oxygen Storage Tanks are typically equipped with safety devices such as pressure sensors, temperature sensors, and safety valves to ensure safe operation.
It's important to note that the use of liquid oxygen tanks must strictly adhere to relevant safety regulations and operational guidelines to ensure safe operation and usage. Liquid oxygen is highly flammable, so fire prevention measures must be taken when using liquid oxygen tanks, and it's crucial to ensure there are no ignition sources nearby.
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